﻿#include "crcutil.h"

#include <cstring>
#include <algorithm>
#include <QDataStream>
#include <QDebug>

static const unsigned short wCRCTable[] = {
0X0000, 0XC0C1, 0XC181, 0X0140, 0XC301, 0X03C0, 0X0280, 0XC241,
0XC601, 0X06C0, 0X0780, 0XC741, 0X0500, 0XC5C1, 0XC481, 0X0440,
0XCC01, 0X0CC0, 0X0D80, 0XCD41, 0X0F00, 0XCFC1, 0XCE81, 0X0E40,
0X0A00, 0XCAC1, 0XCB81, 0X0B40, 0XC901, 0X09C0, 0X0880, 0XC841,
0XD801, 0X18C0, 0X1980, 0XD941, 0X1B00, 0XDBC1, 0XDA81, 0X1A40,
0X1E00, 0XDEC1, 0XDF81, 0X1F40, 0XDD01, 0X1DC0, 0X1C80, 0XDC41,
0X1400, 0XD4C1, 0XD581, 0X1540, 0XD701, 0X17C0, 0X1680, 0XD641,
0XD201, 0X12C0, 0X1380, 0XD341, 0X1100, 0XD1C1, 0XD081, 0X1040,
0XF001, 0X30C0, 0X3180, 0XF141, 0X3300, 0XF3C1, 0XF281, 0X3240,
0X3600, 0XF6C1, 0XF781, 0X3740, 0XF501, 0X35C0, 0X3480, 0XF441,
0X3C00, 0XFCC1, 0XFD81, 0X3D40, 0XFF01, 0X3FC0, 0X3E80, 0XFE41,
0XFA01, 0X3AC0, 0X3B80, 0XFB41, 0X3900, 0XF9C1, 0XF881, 0X3840,
0X2800, 0XE8C1, 0XE981, 0X2940, 0XEB01, 0X2BC0, 0X2A80, 0XEA41,
0XEE01, 0X2EC0, 0X2F80, 0XEF41, 0X2D00, 0XEDC1, 0XEC81, 0X2C40,
0XE401, 0X24C0, 0X2580, 0XE541, 0X2700, 0XE7C1, 0XE681, 0X2640,
0X2200, 0XE2C1, 0XE381, 0X2340, 0XE101, 0X21C0, 0X2080, 0XE041,
0XA001, 0X60C0, 0X6180, 0XA141, 0X6300, 0XA3C1, 0XA281, 0X6240,
0X6600, 0XA6C1, 0XA781, 0X6740, 0XA501, 0X65C0, 0X6480, 0XA441,
0X6C00, 0XACC1, 0XAD81, 0X6D40, 0XAF01, 0X6FC0, 0X6E80, 0XAE41,
0XAA01, 0X6AC0, 0X6B80, 0XAB41, 0X6900, 0XA9C1, 0XA881, 0X6840,
0X7800, 0XB8C1, 0XB981, 0X7940, 0XBB01, 0X7BC0, 0X7A80, 0XBA41,
0XBE01, 0X7EC0, 0X7F80, 0XBF41, 0X7D00, 0XBDC1, 0XBC81, 0X7C40,
0XB401, 0X74C0, 0X7580, 0XB541, 0X7700, 0XB7C1, 0XB681, 0X7640,
0X7200, 0XB2C1, 0XB381, 0X7340, 0XB101, 0X71C0, 0X7080, 0XB041,
0X5000, 0X90C1, 0X9181, 0X5140, 0X9301, 0X53C0, 0X5280, 0X9241,
0X9601, 0X56C0, 0X5780, 0X9741, 0X5500, 0X95C1, 0X9481, 0X5440,
0X9C01, 0X5CC0, 0X5D80, 0X9D41, 0X5F00, 0X9FC1, 0X9E81, 0X5E40,
0X5A00, 0X9AC1, 0X9B81, 0X5B40, 0X9901, 0X59C0, 0X5880, 0X9841,
0X8801, 0X48C0, 0X4980, 0X8941, 0X4B00, 0X8BC1, 0X8A81, 0X4A40,
0X4E00, 0X8EC1, 0X8F81, 0X4F40, 0X8D01, 0X4DC0, 0X4C80, 0X8C41,
0X4400, 0X84C1, 0X8581, 0X4540, 0X8701, 0X47C0, 0X4680, 0X8641,
0X8201, 0X42C0, 0X4380, 0X8341, 0X4100, 0X81C1, 0X8081, 0X4040
};

CRCUtil::CRCUtil(QObject *parent) : QObject(parent)
{

}

unsigned short CRCUtil::CRC16_Check(unsigned char *nData ,unsigned short wLength)
{
    unsigned char nTemp;
    unsigned short wCRCWord = 0xFFFF;
    while (wLength--) {
        nTemp = *nData++ ^ wCRCWord;
        wCRCWord >>= 8;
        wCRCWord  ^= wCRCTable[nTemp];
    }
    return wCRCWord;
}

QList<char> CRCUtil::Parase(unsigned short incrc16)
{
    QList<char> ret;
    char low = incrc16 & 0xff;
    ret.append(low);
    char high = incrc16 >> 8;
    ret.append(high);
    return ret;
}

QByteArray CRCUtil::ParaseByteArray(unsigned short incrc16)
{
    QList<char> lst=Parase(incrc16);
    QByteArray ret;
    for(char c:lst)
    {
        ret.append(c);
    }
    return ret;
}

float CRCUtil::ArrayToFloat(QByteArray data)
{
    data=data.toHex();
    if(8 != data.count()) {
        return -1;
    }
    QByteArray tem;
    for(int i = 3; i>=0; i--) {
        tem.append(data.at(2*i));
        tem.append(data.at(2*i + 1));
    }
    uint hex_uint = tem.toUInt(0,16);
    float hex_res=-1;
    std::memcpy(&hex_res, &hex_uint, sizeof(float)); // 将二进制数据复制到浮点数
    return hex_res;
}

QByteArray CRCUtil::FloatToArray(float value)
{
//    uint f_uint = *(uint*)&value;
//    QString f_hex  = QString("%1").arg(f_uint,4,16,QLatin1Char('0'));
//    QByteArray ret=QByteArray::fromHex(f_hex.toUtf8());
//    std::reverse(ret.begin(),ret.end());
//    return ret;
    QByteArray byteArray;
    QDataStream stream(&byteArray, QIODevice::WriteOnly);
    stream.setFloatingPointPrecision(QDataStream::SinglePrecision);
    stream << value;
    std::reverse(byteArray.begin(),byteArray.end());
    return byteArray;
}

int CRCUtil::ArrayToInt(QByteArray data)
{
    std::reverse(data.begin(),data.end());
    return data.toHex().toInt(0,16);
}

QByteArray CRCUtil::IntToArray(int value)
{
    QByteArray byteArray;
    QDataStream stream(&byteArray, QIODevice::ReadWrite);
    stream<<value;
    std::reverse(byteArray.begin(),byteArray.end());
    return byteArray;
}
